Research on properties and thermal stability mechanism of aluminum-niobium slag
To develop and utilize aluminum-niobium slag,a kind of non-ferrous metallurgical waste residue produced in the preparation of metal niobium by the aluminothermic reduction method,the chemical com-position,phase composition,microstructure and properties of aluminum-niobium slag were studied by ICP,XRD,SEM,TG-DTA and other characterization techniques.The results show that the oxidation of Nb and NbO leads to the poor volume thermal stability of aluminum-niobium slag.After heat treating the aluminum-niobium slag at different temperatures(400-1 500 ℃),it is found that high temperature pre-firing treatment can effectively solve the problem of poor volume thermal stability of the aluminum-niobium slag.After pre-firing at 1 400 ℃ or above,the aluminum-niobium slag has stable phase composition and volume change rate as well as the refractoriness＞1 790 ℃,which meets the basic requirements of refractories for raw ma-terials and lays a good foundation for its resource utilization.
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